EP1359067B1 - Retractor for a vehicle safety belt - Google Patents

Retractor for a vehicle safety belt Download PDF

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Publication number
EP1359067B1
EP1359067B1 EP03008755A EP03008755A EP1359067B1 EP 1359067 B1 EP1359067 B1 EP 1359067B1 EP 03008755 A EP03008755 A EP 03008755A EP 03008755 A EP03008755 A EP 03008755A EP 1359067 B1 EP1359067 B1 EP 1359067B1
Authority
EP
European Patent Office
Prior art keywords
locking
belt
wheel
retractor according
drive wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03008755A
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German (de)
French (fr)
Other versions
EP1359067A2 (en
EP1359067A3 (en
Inventor
Cornelius Peter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BCS Automotive Interface Solutions GmbH
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BCS Automotive Interface Solutions GmbH
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Publication date
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Publication of EP1359067A2 publication Critical patent/EP1359067A2/en
Publication of EP1359067A3 publication Critical patent/EP1359067A3/en
Application granted granted Critical
Publication of EP1359067B1 publication Critical patent/EP1359067B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/44—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/343—Belt retractors, e.g. reels with electrically actuated locking means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
    • B60R2022/287—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material of torsion rods or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/44—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions
    • B60R2022/442—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions using one spring and one additional retraction device in parallel
    • B60R2022/444—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions using one spring and one additional retraction device in parallel the additional retraction device being an electric actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/341—Belt retractors, e.g. reels comprising energy-absorbing means
    • B60R22/3413—Belt retractors, e.g. reels comprising energy-absorbing means operating between belt reel and retractor frame

Definitions

  • the invention relates to a belt retractor for a vehicle seat belt, a frame, a belt spool rotatably mounted in the frame, a drive motor, which can cooperate with a drive wheel with the belt reel is coupled, a blocking pawl and a blocking toothing, in which the locking pawl can be controlled to the belt reel To block.
  • Such a belt retractor is known from DE 100 18 972.
  • the locking pawl is of a spring in the sense of engaging in the locking teeth applied. It is an electromagnet provided in the switched on Condition holds the blocking pawl out of engagement with the locking teeth.
  • the object of the invention is the known belt retractor to improve that results in a lower construction cost.
  • the belt retractor in a belt retractor of the beginning provided type mentioned that limits the drive wheel relative to the belt reel is rotatable and that the blocking pawl in response to this relative rotation is controlled.
  • the belt retractor according to the invention is based on the Basic idea, the already existing drive motor for the belt reel now also to use to control the locking pawl. this happens in that the drive motor is controlled so that the to control the Blocking pawl required relative rotation between the drive wheel and the Belt spool yields. This makes it possible to dispense with additional components that previously required to operate the locking pawl.
  • the blocking teeth on a Blocking is formed, which is fixedly connected to the belt reel, and that between the drive wheel and the blocking wheel at least one return spring is provided, the drive wheel relative to the blocking wheel in a Applied starting position.
  • the blocking pawl of a locking spring permanently in the sense of an intervention in the locking teeth acted upon, wherein the drive wheel is provided with a control toothing, the by depressions in the otherwise smooth outer peripheral surface of the Drive wheel is formed, and wherein the locking teeth and the Control teeth are formed so that in the starting position between Drive wheel and blocking wheel the outer peripheral surface of the drive wheel prevents the blocking pawl from being introduced into the blocking toothing.
  • the return spring can be dimensioned so that the drag torque of the de-energized drive motor is greater than the torque required for twisting the drive wheel is required relative to the blocking wheel. This way will achieved an emergency lock, which then the belt reel in the webbing withdrawal direction locks when the drive motor stops.
  • the return spring can also be dimensioned so strong that it is the slow withdrawal of Belt strap from the belt reel not to a relative rotation between the drive wheel and blocking wheel comes, but only when a predetermined Spin of the belt reel, since in this case the rotational moment of inertia the drive motor also acts as a brake. In this way For example, it is possible to realize a blocking function similar to that of a conventional one mechanical, webbing-sensitive blocking corresponds.
  • the cooperating with the blocking pawl edge of the blocking teeth not undercut. This allows the control toothing of the drive wheel, the blocking pawl with blocked belt reel from the blocking toothing here tenuously without for this purpose the belt reel in the webbing take-up must be turned; such a turn would be from Vehicle occupants as a disturbing, short-term increase in Gurtbandkraft felt.
  • a Aufwickelfeder is provided which the belt reel in the Gurtband-Avemwickelraum applied with a torque that is greater as the drag torque of the drive motor when it is de-energized. This too ensures a limp-home function to the effect that at the interruption electrical supply to the drive motor or the failure of the latter Control in any case ensures that the webbing is properly is wound up when the vehicle occupant takes off the seatbelt.
  • an electronic control unit is provided which the Drive motor controls so that when removing or winding the webbing always a predetermined Gurtbandkraft acts.
  • the control unit recognizes the Rotation of the belt reel, for example by means of a belt spool sensor, and controls the drive motor and thus the rotation of the belt reel so that the Webbing is available in the desired manner. If the Vehicle occupant for example, the seat belt applies, provides the drive motor a torque ready that matches the torque of the take-up spring is opposite. This results in a comparatively low Gurtbandabzugskraft.
  • the torque provided by the drive motor becomes preferably varies so that for the vehicle occupants a constant Gurtband-Abziehskraft is noticeable, although that exerted by the Aufwickelfeder Torque increases with increasing webbing withdrawal.
  • the drive motor can provide a torque when winding the webbing, the Torque of the winding spring counteracts. In this way, the comparatively high webbing take-up force of the take-up spring on a reduced comfort level.
  • the control unit may receive a signal input for vehicle acceleration have, wherein the control unit when exceeding a predetermined Vehicle acceleration controls the drive motor so that the drive wheel is brought into a blocking position relative to the blocking wheel, in which the Locking pawl engages in the locking teeth.
  • the signal for the Vehicle acceleration can come from existing systems, for example, an electronic stability program or an anti-lock braking system, and the control unit via a vehicle bus system, for example a CAN bus. In this way, can be with little Effort realize the vehicle-sensitive blocking of the belt reel.
  • FIGS. 1 and 2 show a belt retractor comprising a frame 10 and a belt reel 12 rotatably mounted in the frame.
  • a vehicle seat belt can be accommodated on the belt reel.
  • a torsion bar 14 is arranged, which at its respect to Figure 1 the left end is rotatably connected to the belt reel 12.
  • a take-up spring 16 connected, which the belt reel 12 in the webbing take-up applied.
  • a blocking wheel 18 With respect to Figure 1 right end of Torsionsstabes 14 is a blocking wheel 18 rotatably connected.
  • the blocking wheel 18 has a smooth outer peripheral surface which is spaced at regular intervals Wells 20 is interrupted.
  • the depressions 20 have a radial Direction oriented flank and an angle from the lowest point of the Groove to the outer peripheral surface extending edge, wherein the radial aligned flank is the one that upon rotation of the belt reel 12 and so that the blocking wheel 18 is in the webbing unwinding behind. All Recesses 20 together form a blocking toothing on the blocking wheel 18.
  • a drive wheel 22 Concentric on the blocking wheel 18, a drive wheel 22 is arranged, the is provided with two recesses 24. In each recess 24 engages a tab 26, which are formed on the blocking wheel 18. Between each tab 26 and a wall of the recess 24 is a return spring 28 (see Figure 3) arranged, the drive wheel 22 relative to the blocking wheel 18 in a in Figure 3 apply the initial position shown.
  • the drive wheel 22 is on his Outer circumferential surface in the same manner as the blocking wheel 18 with a plurality Recesses provided here with the reference numeral 30 are provided.
  • the depressions 30 of the drive wheel 22 in the Difference to the depressions 20 of the blocking wheel 18 are the depressions 30 of the drive wheel 22 with two arranged approximately symmetrically, obliquely formed extending flanks, so that a control toothing is formed.
  • the drive motor 36 is coupled with the drive wheel 22 and a motorcycle 34th .
  • the drive motor is preferably a synchronous external rotor motor.
  • the drive motor is controlled by a control unit 38 shown schematically, the signals from a schematically illustrated vehicle acceleration sensor 40 and a schematically shown belt spool sensor 44 receives the rotation of the Belt spool detected.
  • two blocking pawls 46 are mounted, the one another with respect to the axis of rotation of the blocking wheel 18 and the drive wheel 22 diametrically opposite.
  • the two blocking pawls 46 can in the Blocking teeth of the blocking wheel 18 are controlled. To this end they are each by a blocking spring 48 (indicated in Figure 3) in the sense an engagement in the blocking teeth of the blocking wheel 18 acted upon.
  • the starting point is an equilibrium state, where the webbing forces, the torque of the winding spring and the torque of the drive motor are in equilibrium, so that the Belt reel does not turn.
  • the Aufwickelfeder 16 is dimensioned so that at de-energized drive motor 36, rotate the belt reel in the take-up direction can, is required for this equilibrium state that the drive motor 36th largely compensates for the torque of the take-up spring.
  • the drive motor So tries the drive wheel with respect to Figure 3 against the To turn clockwise.
  • the drive wheel 22 is relatively to the blocking wheel 18 in the starting position shown in Figure 3, the characterized in that the recesses 20 of the blocking wheel 18 offset to the depressions 30 of the drive wheel 22 are arranged. In other words the recesses of a wheel are always in an angular range, in which the other wheel has a smooth outer peripheral surface.
  • the belt reel is applied very quickly in the webbing unwinding direction, "overtakes” them the drive wheel, wherein the return springs 28 are compressed.
  • the Recesses 20 of the blocking wheel 18 then get in overlap with the Recesses 30 of the drive wheel 22 (see Figure 3), and the blocking pawls 46th can engage in the next recess 20 of the blocking wheel 18; the Belt reel is then blocked. This condition is shown in FIG.
  • the drive motor is driven so that the drive wheel 22nd is rotated counterclockwise with respect to FIG.
  • the running corresponding flanks of the recesses 30 of the drive wheel 22 on the tips the blocking pawls 46 and push them radially outward until they come out of the Blocking teeth of the blocking wheel 18 are controlled.
  • the belt spool slightly in the webbing take-up direction too rotate, since the flanks of the blocking teeth on which the blocking pawls 46 abutment, are radially aligned.
  • the blocking is lifted again as soon as the blocking pawls 46 on the smooth outer peripheral surface of the drive wheel 22nd rest and leave the corresponding recess 20 of the blocking wheel 18 to have.
  • control unit 38 can be a variety of convenience features realize in normal operation of the belt retractor. For example, can be ensure that the webbing winding force when applying the belt is lower than at the time of departure or even when driving depending on the driving style changes. Furthermore, it can be ensured that the Webbing take-up regardless of the length of the already wound Webbing does not change.

Description

Die Erfindung betrifft einen Gurtaufroller für einen Fahrzeug-Sicherheitsgurt, mit einem Rahmen, einer Gurtspule, die drehbar in dem Rahmen angebracht ist, einem Antriebsmotor, der mit einem Antriebsrad zusammenwirken kann, das mit der Gurtspule gekoppelt ist, einer Blockierklinke und einer Blockierverzahnung, in welche die Blockierklinke eingesteuert werden kann, um die Gurtspule zu blockieren.The invention relates to a belt retractor for a vehicle seat belt, a frame, a belt spool rotatably mounted in the frame, a drive motor, which can cooperate with a drive wheel with the belt reel is coupled, a blocking pawl and a blocking toothing, in which the locking pawl can be controlled to the belt reel To block.

Ein solcher Gurtaufroller ist aus der DE 100 18 972 bekannt. Die Blockierklinke ist von einer Feder im Sinne eines Eingriffs in die Blockierverzahnung beaufschlagt. Es ist ein Elektromagnet vorgesehen, der im eingeschalteten Zustand die Blockierklinke außer Eingriff mit der Blockierverzahnung hält.Such a belt retractor is known from DE 100 18 972. The locking pawl is of a spring in the sense of engaging in the locking teeth applied. It is an electromagnet provided in the switched on Condition holds the blocking pawl out of engagement with the locking teeth.

Die Aufgabe der Erfindung besteht darin, den bekannten Gurtaufroller dahingehend zu verbessern, daß sich ein geringerer Bauaufwand ergibt.The object of the invention is the known belt retractor to improve that results in a lower construction cost.

Zu diesem Zweck ist erfindungsgemäß bei einem Gurtaufroller der eingangs genannten Art vorgesehen, daß das Antriebsrad relativ zur Gurtspule begrenzt verdrehbar ist und daß die Blockierklinke in Abhängigkeit von dieser Relativdrehung gesteuert wird. Der erfindungsgemäße Gurtaufroller beruht auf dem Grundgedanken, den ohnehin schon vorhandenen Antriebsmotor für die Gurtspule nun auch zur Steuerung der Blockierklinke zu verwenden. Dies geschieht dadurch, daß der Antriebsmotor so gesteuert wird, daß sich die zur Steuerung der Blockierklinke erforderliche Relativdrehung zwischen dem Antriebsrad und der Gurtspule ergibt. Dies ermöglicht es, auf zusätzliche Bauteile zu verzichten, die bisher zur Betätigung der Blockierklinke erforderlich waren.For this purpose, according to the invention in a belt retractor of the beginning provided type mentioned that limits the drive wheel relative to the belt reel is rotatable and that the blocking pawl in response to this relative rotation is controlled. The belt retractor according to the invention is based on the Basic idea, the already existing drive motor for the belt reel now also to use to control the locking pawl. this happens in that the drive motor is controlled so that the to control the Blocking pawl required relative rotation between the drive wheel and the Belt spool yields. This makes it possible to dispense with additional components that previously required to operate the locking pawl.

Vorzugsweise ist vorgesehen, daß die Blockierverzahnung an einem Blockierrad ausgebildet ist, das fest mit der Gurtspule verbunden ist, und daß zwischen dem Antriebsrad und dem Blockierrad wenigstens eine Rückstellfeder vorgesehen ist, die das Antriebsrad relativ zum Blockierrad in eine Ausgangsstellung beaufschlagt. Dabei wird vorzugsweise die Blockierklinke von einer Blockierfeder permanent im Sinne eines Eingriffs in die Blockierverzahnung beaufschlagt, wobei das Antriebsrad mit einer Steuerverzahnung versehen ist, die durch Vertiefungen in der ansonsten glatten Außenumfangsfläche des Antriebsrades gebildet ist, und wobei die Blockierverzahnung und die Steuerverzahnung so ausgebildet sind, daß in der Ausgangsstellung zwischen Antriebsrad und Blockierrad die Außenumfangsfläche des Antriebsrades verhindert, daß die Blockierklinke in die Blockierverzahnung eingesteuert wird. Die Rückstellfeder kann dabei so dimensioniert sein, daß das Schleppmoment des stromlosen Antriebsmotors größer ist als das Drehmoment, das zum Verdrehen des Antriebsrades relativ zum Blockierrad erforderlich ist. Auf diese Weise wird eine Notlauf-Sperrung erzielt, die die Gurtspule dann in der Gurtband-Abzugsrichtung sperrt, wenn der Antriebsmotor stehenbleibt. Die Rückstellfeder kann auch derart stärker dimensioniert werden, daß es beim langsamen Abzug von Gurtband von der Gurtspule nicht zu einer Relativdrehung zwischen Antriebsrad und Blockierrad kommt, sondern erst beim Überschreiten einer vorbestimmten Drehbeschleunigung der Gurtspule, da in diesem Fall das Rotationsträgheitsmoment des Antriebsmotors zusätzlich als Bremse wirkt. Auf diese Weise kann eine Blockierfunktion verwirklicht werden, die einer herkömmlichen mechanischen, gurtbandsensitiven Blockierung entspricht. Preferably, it is provided that the blocking teeth on a Blocking is formed, which is fixedly connected to the belt reel, and that between the drive wheel and the blocking wheel at least one return spring is provided, the drive wheel relative to the blocking wheel in a Applied starting position. In this case, preferably the blocking pawl of a locking spring permanently in the sense of an intervention in the locking teeth acted upon, wherein the drive wheel is provided with a control toothing, the by depressions in the otherwise smooth outer peripheral surface of the Drive wheel is formed, and wherein the locking teeth and the Control teeth are formed so that in the starting position between Drive wheel and blocking wheel the outer peripheral surface of the drive wheel prevents the blocking pawl from being introduced into the blocking toothing. The return spring can be dimensioned so that the drag torque of the de-energized drive motor is greater than the torque required for twisting the drive wheel is required relative to the blocking wheel. This way will achieved an emergency lock, which then the belt reel in the webbing withdrawal direction locks when the drive motor stops. The return spring can also be dimensioned so strong that it is the slow withdrawal of Belt strap from the belt reel not to a relative rotation between the drive wheel and blocking wheel comes, but only when a predetermined Spin of the belt reel, since in this case the rotational moment of inertia the drive motor also acts as a brake. In this way For example, it is possible to realize a blocking function similar to that of a conventional one mechanical, webbing-sensitive blocking corresponds.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist vorgesehen, daß die mit der Blockierklinke zusammenwirkende Flanke der Blockierverzahnung nicht hinterschnitten ist. Dies ermöglicht der Steuerverzahnung des Antriebsrades, die Blockierklinke bei blockierter Gurtspule aus der Blockierverzahnung auszusteuern, ohne daß zu diesem Zweck die Gurtspule in der Gurtband-Aufwickelrichtung gedreht werden muß; eine solche Drehung würde vom Fahrzeuginsassen als störende, kurzzeitige Erhöhung der Gurtbandkraft empfunden.According to a preferred embodiment of the invention it is provided that the cooperating with the blocking pawl edge of the blocking teeth not undercut. This allows the control toothing of the drive wheel, the blocking pawl with blocked belt reel from the blocking toothing auszusteuern without for this purpose the belt reel in the webbing take-up must be turned; such a turn would be from Vehicle occupants as a disturbing, short-term increase in Gurtbandkraft felt.

Vorzugsweise ist eine Aufwickelfeder vorgesehen, welche die Gurtspule in der Gurtband-Aufwickelrichtung mit einem Drehmoment beaufschlagt, das größer ist als das Schleppmoment des Antriebsmotors, wenn dieser stromlos ist. Auch dies gewährleistet eine Notlauffunktion dahingehend, daß bei der Unterbrechung der elektrischen Versorgung des Antriebsmotors oder beim Ausfall von dessen Steuerung in jedem Fall gewährleistet ist, daß das Gurtband ordnungsgemäß aufgewickelt wird, wenn der Fahrzeuginsasse den Sicherheitsgurt ablegt.Preferably, a Aufwickelfeder is provided which the belt reel in the Gurtband-Aufwickelrichtung applied with a torque that is greater as the drag torque of the drive motor when it is de-energized. This too ensures a limp-home function to the effect that at the interruption electrical supply to the drive motor or the failure of the latter Control in any case ensures that the webbing is properly is wound up when the vehicle occupant takes off the seatbelt.

Vorzugsweise ist eine elektronische Steuereinheit vorgesehen, die den Antriebsmotor so steuert, daß beim Abziehen bzw. Aufwickeln des Gurtbandes immer eine vorbestimmte Gurtbandkraft wirkt. Die Steuereinheit erkennt die Drehung der Gurtspule, beispielsweise mittels eines Gurtspulen-Sensors, und steuert den Antriebsmotor und damit die Drehung der Gurtspule so, daß das Gurtband in der gewünschten Weise zur Verfügung steht. Wenn der Fahrzeuginsasse beispielsweise den Sicherheitsgurt anlegt, stellt der Antriebsmotor ein Drehmoment bereit, das dem Drehmoment der Aufwickelfeder entgegengerichtet ist. Auf diese Weise ergibt sich eine vergleichsweise niedrige Gurtbandabzugskraft. Das vom Antriebsmotor bereitgestellte Drehmoment wird dabei vorzugsweise so variiert, daß für den Fahrzeuginsassen eine konstante Gurtband-Abzugskraft spürbar ist, obwohl das von der Aufwickelfeder ausgeübte Drehmoment mit zunehmendem Gurtbandabzug ansteigt. Der Antriebsmotor kann auch beim Aufwickeln des Gurtbandes ein Drehmoment bereitstellen, das dem Drehmoment der Aufwickelfeder entgegenwirkt. Auf diese Weise wird die vergleichsweise hohe Gurtband-Aufwickelkraft der Aufwickelfeder auf ein komfortableres Maß herabgesetzt.Preferably, an electronic control unit is provided which the Drive motor controls so that when removing or winding the webbing always a predetermined Gurtbandkraft acts. The control unit recognizes the Rotation of the belt reel, for example by means of a belt spool sensor, and controls the drive motor and thus the rotation of the belt reel so that the Webbing is available in the desired manner. If the Vehicle occupant for example, the seat belt applies, provides the drive motor a torque ready that matches the torque of the take-up spring is opposite. This results in a comparatively low Gurtbandabzugskraft. The torque provided by the drive motor becomes preferably varies so that for the vehicle occupants a constant Gurtband-Abziehskraft is noticeable, although that exerted by the Aufwickelfeder Torque increases with increasing webbing withdrawal. The drive motor can provide a torque when winding the webbing, the Torque of the winding spring counteracts. In this way, the comparatively high webbing take-up force of the take-up spring on a reduced comfort level.

Die Steuereinheit kann einen Signaleingang für die Fahrzeugbeschleunigung aufweisen, wobei die Steuereinheit beim Überschreiten einer vorbestimmten Fahrzeugbeschleunigung den Antriebsmotor so steuert, daß das Antriebsrad relativ zum Blockierrad in eine Blockierstellung gebracht wird, in der die Blockierklinke in die Blockierverzahnung eingreift. Das Signal für die Fahrzeugbeschleunigung kann von bereits vorhandenen Systemen stammen, beispielsweise einem elektronischen Stabilitätsprogramm oder einem Antiblockiersystem, und der Steuereinheit über ein Fahrzeug-Bussystem, beispielsweise einen CAN-Bus, geliefert werden. Auf diese Weise läßt sich mit geringem Aufwand die fahrzeugsensitive Blockierung der Gurtspule verwirklichen.The control unit may receive a signal input for vehicle acceleration have, wherein the control unit when exceeding a predetermined Vehicle acceleration controls the drive motor so that the drive wheel is brought into a blocking position relative to the blocking wheel, in which the Locking pawl engages in the locking teeth. The signal for the Vehicle acceleration can come from existing systems, for example, an electronic stability program or an anti-lock braking system, and the control unit via a vehicle bus system, for example a CAN bus. In this way, can be with little Effort realize the vehicle-sensitive blocking of the belt reel.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous embodiments of the invention will become apparent from the dependent claims.

Die Erfindung wird nachfolgend anhand einer bevorzugten Ausführungsform beschrieben, die in den beigefügten Zeichnungen dargestellt ist. In diesen zeigen:

  • Figur 1 in einer schematischen Explosionsansicht einen erfindungsgemäßen Gurtaufroller;
  • Figur 2 in einer perspektivischen, schematischen Ansicht den Gurtaufroller von Figur 1, wobei zur besseren Übersichtlichkeit einige Bauteile nicht dargestellt sind;
  • Figur 3 in einer perspektivischen, vergrößerten Ansicht den Blockiermechanismus des Gurtaufrollers von Figur 2 im nicht blockierten Zustand;
  • Figur 4 den Blockiermechanismus von Figur 3 im blockierten Zustand; und
  • Figur 5 ein Diagramm des Verlaufs der Gurtbandabzugskraft, der Federkennlinie der Aufwickelfeder sowie des Drehmoments des Antriebsmotors bei verschiedenen Betriebszuständen.
The invention will be described below with reference to a preferred embodiment, which is illustrated in the accompanying drawings. In these show:
  • Figure 1 is a schematic exploded view of a belt retractor according to the invention;
  • Figure 2 is a perspective, schematic view of the belt retractor of Figure 1, with some components are not shown for clarity;
  • Figure 3 is a perspective, enlarged view of the locking mechanism of the belt retractor of Figure 2 in the unlocked state;
  • FIG. 4 shows the blocking mechanism of FIG. 3 in the locked state; and
  • Figure 5 is a diagram of the course of Gurtbandabzugskraft, the spring characteristic of Aufwickelfeder and the torque of the drive motor at different operating conditions.

In den Figuren 1 und 2 ist ein Gurtaufroller zu sehen, der einen Rahmen 10 und eine drehbar im Rahmen gelagerte Gurtspule 12 aufweist. Auf der Gurtspule kann ein Fahrzeug-Sicherheitsgurt aufgenommen werden. Im Inneren der Gurtspule 12 ist ein Torsionsstab 14 angeordnet, der an seinem bezüglich Figur 1 linken Ende drehfest mit der Gurtspule 12 verbunden ist. An diesem Ende ist auch eine Aufwickelfeder 16 angeschlossen, welche die Gurtspule 12 in der Gurtband-Aufwickelrichtung beaufschlagt. Mit dem bezüglich Figur 1 rechten Ende des Torsionsstabes 14 ist ein Blockierrad 18 drehfest verbunden. Das Blockierrad 18 weist eine glatte Außenumfangsfläche auf, die in regelmäßigen Abständen von Vertiefungen 20 unterbrochen ist. Die Vertiefungen 20 weisen eine in radialer Richtung ausgerichtete Flanke sowie eine schräg vom tiefsten Punkt der Vertiefung zur Außenumfangsfläche verlaufende Flanke auf, wobei die radial ausgerichtete Flanke diejenige ist, die bei einer Drehung der Gurtspule 12 und damit des Blockierrades 18 in der Gurtband-Abwickelrichtung hinten liegt. Alle Vertiefungen 20 zusammen bilden eine Blockierverzahnung am Blockierrad 18.FIGS. 1 and 2 show a belt retractor comprising a frame 10 and a belt reel 12 rotatably mounted in the frame. On the belt reel a vehicle seat belt can be accommodated. Inside the Belt reel 12, a torsion bar 14 is arranged, which at its respect to Figure 1 the left end is rotatably connected to the belt reel 12. At this end too a take-up spring 16 connected, which the belt reel 12 in the webbing take-up applied. With respect to Figure 1 right end of Torsionsstabes 14 is a blocking wheel 18 rotatably connected. The blocking wheel 18 has a smooth outer peripheral surface which is spaced at regular intervals Wells 20 is interrupted. The depressions 20 have a radial Direction oriented flank and an angle from the lowest point of the Groove to the outer peripheral surface extending edge, wherein the radial aligned flank is the one that upon rotation of the belt reel 12 and so that the blocking wheel 18 is in the webbing unwinding behind. All Recesses 20 together form a blocking toothing on the blocking wheel 18.

Konzentrisch auf dem Blockierrad 18 ist ein Antriebsrad 22 angeordnet, das mit zwei Aussparungen 24 versehen ist. In jeder Aussparung 24 greift eine Lasche 26 ein, die am Blockierrad 18 ausgebildet sind. Zwischen jeder Lasche 26 und einer Wand der Aussparung 24 ist eine Rückstellfeder 28 (siehe Figur 3) angeordnet, die das Antriebsrad 22 relativ zum Blockierrad 18 in eine in Figur 3 gezeigte Ausgangsstellung beaufschlagen. Das Antriebsrad 22 ist auf seiner Außenumfangsfläche in gleicher Weise wie das Blockierrad 18 mit mehreren Vertiefungen versehen, die hier mit dem Bezugszeichen 30 versehen sind. Im Unterschied zu den Vertiefungen 20 des Blockierrades 18 sind die Vertiefungen 30 des Antriebsrades 22 mit zwei etwa symmetrisch angeordneten, schräg verlaufenden Flanken ausgebildet, so daß eine Steuerverzahnung ausgebildet ist.Concentric on the blocking wheel 18, a drive wheel 22 is arranged, the is provided with two recesses 24. In each recess 24 engages a tab 26, which are formed on the blocking wheel 18. Between each tab 26 and a wall of the recess 24 is a return spring 28 (see Figure 3) arranged, the drive wheel 22 relative to the blocking wheel 18 in a in Figure 3 apply the initial position shown. The drive wheel 22 is on his Outer circumferential surface in the same manner as the blocking wheel 18 with a plurality Recesses provided here with the reference numeral 30 are provided. in the Difference to the depressions 20 of the blocking wheel 18 are the depressions 30 of the drive wheel 22 with two arranged approximately symmetrically, obliquely formed extending flanks, so that a control toothing is formed.

Mit dem Antriebsrad 22 ist durch einen Zahnriemen 32 und ein Motorrad 34 ein Antriebsmotor 36 gekoppelt. Bei dem Antriebsmotor handelt es sich vorzugsweise um einen Synchron-Außenläufer-Motor. Der Antriebsmotor wird von einer schematisch dargestellten Steuereinheit 38 angesteuert, die Signale von einem schematisch dargestellten Fahrzeugbeschleunigungssensor 40 und einem schematisch dargestellten Gurtspulen-Sensor 44 empfängt, der die Drehung der Gurtspule erfaßt.With the drive wheel 22 is through a toothed belt 32 and a motorcycle 34th a drive motor 36 is coupled. The drive motor is preferably a synchronous external rotor motor. The drive motor is controlled by a control unit 38 shown schematically, the signals from a schematically illustrated vehicle acceleration sensor 40 and a schematically shown belt spool sensor 44 receives the rotation of the Belt spool detected.

Am Rahmen 10 des Gurtaufrollers sind zwei Blockierklinken 46 angebracht, die einander bezüglich der Drehachse des Blockierrades 18 und des Antriebsrades 22 diametral gegenüberliegen. Die beiden Blockierklinken 46 können in die Blockierverzahnung des Blockierrades 18 eingesteuert werden. Zu diesem Zweck werden sie von jeweils einer Blockierfeder 48 (angedeutet in Figur 3) im Sinne eines Eingriffs in die Blockierverzahnung des Blockierrades 18 beaufschlagt.On the frame 10 of the belt retractor two blocking pawls 46 are mounted, the one another with respect to the axis of rotation of the blocking wheel 18 and the drive wheel 22 diametrically opposite. The two blocking pawls 46 can in the Blocking teeth of the blocking wheel 18 are controlled. To this end they are each by a blocking spring 48 (indicated in Figure 3) in the sense an engagement in the blocking teeth of the blocking wheel 18 acted upon.

Anhand der Figuren 3 bis 5 wird nachfolgend die Funktionsweise des Gurtaufrollers beschrieben. Ausgegangen wird dabei von einem Gleichgewichtszustand, bei dem die Gurtbandkräfte, das Drehmoment der Aufwickelfeder und das Drehmoment des Antriebsmotors im Gleichgewicht stehen, so daß sich die Gurtspule nicht dreht. Da die Aufwickelfeder 16 so dimensioniert ist, daß sie bei stromlosem Antriebsmotor 36 die Gurtspule in der Aufwickelrichtung drehen kann, ist für diesen Gleichgewichtszustand erforderlich, daß der Antriebsmotor 36 das Drehmoment der Aufwickelfeder größtenteils kompensiert. Der Antriebsmotor versucht also, das Antriebsrad bezüglich Figur 3 entgegen dem Uhrzeigersinn zu drehen. Allein hierdurch befindet sich das Antriebsrad 22 relativ zum Blockierrad 18 in der in Figur 3 gezeigten Ausgangsstellung, die sich dadurch auszeichnet, daß die Vertiefungen 20 des Blockierrades 18 versetzt zu den Vertiefungen 30 des Antriebsrades 22 angeordnet sind. Anders ausgedrückt befinden sich die Vertiefungen eines Rades immer in einem Winkelbereich, in welchem das andere Rad eine glatte Außenumfangsfläche aufweist.Reference to the figures 3 to 5, the operation of the Belt retractor described. The starting point is an equilibrium state, where the webbing forces, the torque of the winding spring and the torque of the drive motor are in equilibrium, so that the Belt reel does not turn. Since the Aufwickelfeder 16 is dimensioned so that at de-energized drive motor 36, rotate the belt reel in the take-up direction can, is required for this equilibrium state that the drive motor 36th largely compensates for the torque of the take-up spring. The drive motor So tries the drive wheel with respect to Figure 3 against the To turn clockwise. This alone, the drive wheel 22 is relatively to the blocking wheel 18 in the starting position shown in Figure 3, the characterized in that the recesses 20 of the blocking wheel 18 offset to the depressions 30 of the drive wheel 22 are arranged. In other words the recesses of a wheel are always in an angular range, in which the other wheel has a smooth outer peripheral surface.

Wenn ausgehend von dem Gleichgewichtszustand von Figur 3 Gurtband von der Gurtspule abgezogen werden soll, sich also die Gurtspule bezüglich Figur 3 entgegen dem Uhrzeigersinn dreht, unterstützt dies der Antriebsmotor, um die am Gurtband verspürte Kraft auf ein komfortableres Niveau zu senken, das unter demjenigen Niveau liegt, das zum Überwinden der Aufwickelfeder erforderlich wäre. Beim Abwickeln des Gurtbandes verbleibt das Antriebsrad 22 relativ zum Blockierrad 18 in der Ausgangsstellung, so daß die Blockierklinken 46 sich abwechselnd auf der Außenfläche des Antriebsrades 22 und der Außenfläche des Blockierrades 18 abstützen; es ist auf diese Weise verhindert, daß sie in die Blockierverzahnung des Blockierrades 18 eingreifen.When starting from the equilibrium state of Figure 3 webbing of the belt reel to be deducted, so the belt reel with respect to Figure 3 rotates counterclockwise, this supports the drive motor to the on Webbing felt power to lower to a more comfortable level, the under the level required to overcome the Aufwickelfeder would. When unwinding the webbing, the drive wheel 22 remains relative to Blocking wheel 18 in the starting position, so that the blocking pawls 46 themselves alternately on the outer surface of the drive wheel 22 and the outer surface of the Support blocking wheel 18; it is thus prevented from entering the Engage locking teeth of the blocking wheel 18.

Wenn nun durch einen plötzlichen, starken Zug am Gurtband die Gurtspule sehr schnell in der Gurtband-Abwickelrichtung beaufschlagt wird, "überholt" sie das Antriebsrad, wobei die Rückstellfedern 28 zusammengedrückt werden. Die Vertiefungen 20 des Blockierrades 18 gelangen dann in Überdeckung mit den Vertiefungen 30 des Antriebsrades 22 (siehe Figur 3), und die Blockierklinken 46 können in die nächste Vertiefung 20 des Blockierrades 18 eingreifen; die Gurtspule ist dann blockiert. Dieser Zustand ist in Figur 4 gezeigt.If now by a sudden, strong pull on the belt, the belt reel is applied very quickly in the webbing unwinding direction, "overtakes" them the drive wheel, wherein the return springs 28 are compressed. The Recesses 20 of the blocking wheel 18 then get in overlap with the Recesses 30 of the drive wheel 22 (see Figure 3), and the blocking pawls 46th can engage in the next recess 20 of the blocking wheel 18; the Belt reel is then blocked. This condition is shown in FIG.

Wenn ausgehend vom blockierten Zustand die Blockierung wieder gelöst werden soll, wird der Antriebsmotor so angesteuert, daß das Antriebsrad 22 bezüglich Figur 4 entgegen dem Uhrzeigersinn gedreht wird. Dabei laufen die entsprechenden Flanken der Vertiefungen 30 des Antriebsrades 22 auf die Spitzen der Blockierklinken 46 auf und drücken diese radial nach außen, bis sie aus der Blockierverzahnung des Blockierrades 18 ausgesteuert sind. Hierbei ist es nicht erforderlich, die Gurtspule geringfügig in der Gurtband-Aufwickelrichtung zu drehen, da die Flanken der Blockierverzahnung, an denen die Blockierklinken 46 anliegen, radial ausgerichtet sind. Die Blockierung ist wieder aufgehoben, sobald die Blockierklinken 46 auf der glatten Außenumfangsfläche des Antriebsrades 22 aufliegen und die entsprechende Vertiefung 20 des Blockierrades 18 verlassen haben.If, starting from the blocked state, the blocking is released again to be, the drive motor is driven so that the drive wheel 22nd is rotated counterclockwise with respect to FIG. The running corresponding flanks of the recesses 30 of the drive wheel 22 on the tips the blocking pawls 46 and push them radially outward until they come out of the Blocking teeth of the blocking wheel 18 are controlled. This is not it required, the belt spool slightly in the webbing take-up direction too rotate, since the flanks of the blocking teeth on which the blocking pawls 46 abutment, are radially aligned. The blocking is lifted again as soon as the blocking pawls 46 on the smooth outer peripheral surface of the drive wheel 22nd rest and leave the corresponding recess 20 of the blocking wheel 18 to have.

Wenn das Gurtband auf die Gurtspule aufgewickelt werden soll, wird das Haltedrehmoment des Antriebsmotors 36 verringert, so daß die Gurtspule 12 unter der Wirkung der Aufwickelfeder 16 sich in der Gurtband-Aufwickelrichtung dreht.If the webbing is to be wound on the belt reel, that will Holding torque of the drive motor 36 is reduced, so that the belt reel 12 under the action of the take-up spring 16 in the webbing take-up direction rotates.

Wenn das Gurtband auf die Gurtspule 12 aufgewickelt werden soll, ist es lediglich erforderlich, das Haltedrehmoment des Antriebsmotors 36 zu verringern, so daß die dann überwiegende Kraft der Aufwickelfeder dafür sorgt, daß sich die Gurtspule bezüglich den Figuren 3 und 4 im Uhrzeigersinn dreht.When the webbing is to be wound on the belt reel 12, it is only required to reduce the holding torque of the drive motor 36, so that the then overwhelming force of the winding spring ensures that the Belt spool rotates clockwise with respect to Figures 3 and 4.

Falls es zu einem Defekt am Motor oder an der Motorsteuerung kommt und der Motor keinerlei Antriebsdrehmoment bereitstellt, gewährleistet die Aufwickelfeder 16, daß das Gurtband zuverlässig auf der Gurtspule 12 aufgewickelt wird. Auch ist eine Notfall-Blockierung der Gurtspule gewährleistet. Wenn Gurtband vom Gurtaufroller abgezogen wird, wirkt als Widerstandsmoment das Schleppmoment des Antriebsmotors 36 zuzüglich eines trägheitsbedingten Drehmomentes, wenn die Gurtspule eine Drehbeschleunigung erfährt. Dieses Widerstandsmoment ist ausreichend hoch, um die Vorspannung der Rückstellfedern 28 zu überwinden, wodurch das Antriebsrad 22 relativ zum Blockierrad 18 in die in Figur 4 gezeigte Blockierstellung gelangt. Dann werden die Blockierklinken 46 in die nächste Vertiefung 20 des Blockierrades 18 eingreifen und die Gurtspule blockieren.If there is a defect in the engine or the engine control and the engine provides no drive torque, ensures the Winding spring 16, that the webbing reliably on the belt reel 12th is wound up. An emergency blocking of the belt reel is guaranteed. When webbing is removed from the belt retractor acts as a resistance moment the drag torque of the drive motor 36 plus an inertia-related Torque when the belt reel undergoes a spin. This Resistance torque is sufficiently high to the bias of the Return springs 28 overcome, whereby the drive wheel 22 relative to Blocking wheel 18 passes into the blocking position shown in Figure 4. Then be the blocking pawls 46 in the next recess 20 of the blocking wheel 18th engage and block the belt reel.

Mittels der Steuereinheit 38 lassen sich eine Vielzahl von Komfortfunktionen im Normalbetrieb des Gurtaufrollers verwirklichen. Beispielsweise läßt sich gewährleisten, daß die Gurtband-Aufwickelkraft beim Anlegen des Gurtes niedriger ist als beim Ablegen oder sich auch bei der Fahrt in Abhängigkeit von der Fahrweise ändert. Weiterhin kann gewährleistet werden, daß sich die Gurtband-Aufwickelkraft unabhängig von der Länge des bereits aufgewickelten Gurtbandes nicht ändert.By means of the control unit 38 can be a variety of convenience features realize in normal operation of the belt retractor. For example, can be ensure that the webbing winding force when applying the belt is lower than at the time of departure or even when driving depending on the driving style changes. Furthermore, it can be ensured that the Webbing take-up regardless of the length of the already wound Webbing does not change.

Abweichend von der gezeigten Ausführungsform ist es auch möglich, die beiden Sperrklinken nicht einander diametral gegenüberliegend, sondern gegenüber der diametralen Anordnung um einen Winkel versetzt anzuordnen, der der Hälfte des Winkelabstandes zwischen zwei Vertiefungen entspricht. Auf diese Weise läßt sich die erforderliche Drehung des Gurtaufrollers bis zu einer Blockierung verringern. Es ist grundsätzlich auch möglich, lediglich eine einzige Blockierklinke zu verwenden.Notwithstanding the embodiment shown, it is also possible that two pawls not diametrically opposed, but relative to the diametrical arrangement to be offset by an angle, the half of the angular distance between two wells corresponds. To this Way, the required rotation of the belt retractor can be up to a Reduce blocking. It is basically possible, only a single Use locking pawl.

Claims (14)

  1. A belt retractor for a vehicle safety belt, comprising a frame (10), a belt spool (12) which is rotatably mounted in the frame (10), a drive motor (36) cooperating with a drive wheel (22) which is coupled with the belt spool (12), a locking catch (46) and locking teeth (20) which the locking catch (46) can be caused to engage in order to lock the belt spool (12), characterized in that the drive wheel (22) is rotatable relative to the belt spool to a limited extent and that the locking catch (46) is controlled as a function of this relative rotation.
  2. The belt retractor according to claim 1, characterized in that the locking teeth (20) are constructed on a locking wheel (18) which is securely connected with the belt spool (12), and that between the drive wheel (22) and the locking wheel (18) at least one restoring spring (28) is provided, which biases the drive wheel relative to the locking wheel into an initial position.
  3. The belt retractor according to claim 2, characterized in that the locking wheel (18) is connected with the belt spool (12) by a torsion rod (14).
  4. The belt retractor according to any of the preceding claims, characterized in that the locking catch (46) is permanently acted upon by a locking spring (48) in the sense of an engagement into the locking teeth (20), that the drive wheel (22) is provided with control teeth (30) which are formed by depressions (30) in the otherwise smooth outer peripheral surface of the drive wheel (22), and that the locking teeth (20) and the control teeth (30) are constructed such that in the initial position between the drive wheel (22) and the locking wheel (18) the outer peripheral surface of the drive wheel (22) prevents the locking catch (46) from being caused to engage into the locking teeth (20).
  5. The belt retractor according to claim 3, characterized in that the locking wheel (18) has an outer peripheral surface which is smooth between the depressions (20) forming the locking teeth, and that the locking catch (46) can rest against the smooth outer peripheral surface.
  6. The belt retractor according to any of the preceding claims, characterized in that the locking catch (46) is pivotally mounted on the frame (10).
  7. The belt retractor according to any of the preceding claims, characterized in that the side of the locking teeth (20) cooperating with the locking catch (46) is not undercut.
  8. The belt retractor according to any of the preceding claims, characterized in that the restoring spring (28), as a function of the drag moment of the drive motor (36) when the latter is currentless, and of the rotational moment of inertia of the drive motor (36), is dimensioned such that a relative rotation between the drive wheel (22) and the locking wheel (18) does not occur until the angular acceleration of the belt spool (12) in the belt webbing withdrawal direction exceeds a predetermined limiting value.
  9. The belt retractor according to any of the preceding claims, characterized in that the restoring spring (28), as a function of the drag moment of the drive motor (36) when the latter is currentless, is dimensioned such that a relative rotation between the drive wheel (22) and the locking wheel (18) occurs when the belt spool (12) is turned in the belt webbing withdrawal direction.
  10. The belt retractor according to any of the preceding claims, characterized in that a wind-up spring (16) is provided, which acts upon the belt spool (12) in the belt webbing wind-up direction with a torque which is greater than the drag moment of the drive motor (36) when the latter is currentless.
  11. The belt retractor according to any of the preceding claims, characterized in that an electronic control unit (38) is provided, which controls the drive motor (36) such that on withdrawal or winding-up of the belt webbing, a predetermined belt webbing force is always active.
  12. The belt retractor according to any of the preceding claims, characterized in that the control unit can receive a signal from a vehicle acceleration sensor (40) and, when a predetermined vehicle acceleration is exceeded, controls the drive motor (36) such that the drive wheel (22) is brought into a locking position relative to the locking wheel (18) in which the locking catch (46) engages into the locking teeth (20).
  13. The belt retractor according to any of the preceding claims, characterized in that the control unit can receive a signal from a belt spool sensor (44), proceeding from which the angular acceleration of the belt spool (12) is determined, and that when a predetermined angular acceleration of the belt spool (12) is exceeded, the control unit (38) controls the drive motor (36) such that the drive wheel (22) is brought into a locking position relative to the locking wheel (18) in which the locking catch (46) engages into the locking teeth (20).
  14. The belt retractor according to claim 13, characterized in that the belt spool sensor (44) is a Hall sensor.
EP03008755A 2002-04-26 2003-04-17 Retractor for a vehicle safety belt Expired - Lifetime EP1359067B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20206667U 2002-04-26
DE20206667U DE20206667U1 (en) 2002-04-26 2002-04-26 Belt retractor for a vehicle seat belt

Publications (3)

Publication Number Publication Date
EP1359067A2 EP1359067A2 (en) 2003-11-05
EP1359067A3 EP1359067A3 (en) 2004-03-24
EP1359067B1 true EP1359067B1 (en) 2005-08-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03008755A Expired - Lifetime EP1359067B1 (en) 2002-04-26 2003-04-17 Retractor for a vehicle safety belt

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US (1) US6848645B2 (en)
EP (1) EP1359067B1 (en)
JP (1) JP3795474B2 (en)
CN (1) CN100354162C (en)
DE (2) DE20206667U1 (en)

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JP2004042782A (en) * 2002-07-11 2004-02-12 Tokai Rika Co Ltd Webbing take-up device
DE20311004U1 (en) * 2003-07-17 2003-12-04 Trw Occupant Restraint Systems Gmbh & Co. Kg Belt retractor for a vehicle seat belt
WO2005051732A1 (en) * 2003-11-27 2005-06-09 Autoliv Development Ab Seat belt retractor
DE202004007307U1 (en) * 2004-05-07 2004-09-16 Trw Automotive Gmbh retractor
JP4580253B2 (en) * 2005-02-21 2010-11-10 株式会社東海理化電機製作所 Webbing take-up device
JP2006290087A (en) * 2005-04-08 2006-10-26 Takata Corp Seat belt retractor and seat belt device furnished with the same
JP4640963B2 (en) * 2005-08-04 2011-03-02 タカタ株式会社 Seat belt retractor and seat belt device provided with the same
JP5261736B2 (en) * 2008-09-16 2013-08-14 タカタ株式会社 Seat belt retractor and seat belt device provided with the same
JP5452186B2 (en) * 2009-11-24 2014-03-26 株式会社東海理化電機製作所 Engaging member support structure and webbing take-up device
US9150193B2 (en) * 2012-06-14 2015-10-06 Autoliv Asp, Inc. Mode detection switch assembly for self-locking dual-mode seat belt retractor
DE102012107557B3 (en) * 2012-08-17 2014-10-30 Autoliv Development Ab Belt retractor with a switchable force limiting device
KR101593414B1 (en) * 2014-06-09 2016-02-12 주식회사 우신세이프티시스템 Electronic Type Retractor for Seat Belt
US10086794B2 (en) * 2015-06-23 2018-10-02 Ford Global Technologies, Llc Load limiting retractor with hall effect switch

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US4765559A (en) * 1987-07-07 1988-08-23 American Safety Equipment Corporation Synchronized safety belt retractor with structural control locking means
FR2696693B1 (en) * 1992-10-09 1994-12-02 Autoliv Klippan Snc Vehicle seat belt strap retractor.
CN1100043A (en) * 1993-09-10 1995-03-15 高田株式会社 Seat belt retractor
DE19513724A1 (en) * 1995-04-11 1996-10-17 Trw Repa Gmbh Belt retractor for a vehicle seat belt system
DE29812435U1 (en) * 1998-07-13 1998-11-12 Trw Repa Gmbh Locking mechanism for a belt retractor
JP4467688B2 (en) * 1999-01-19 2010-05-26 タカタ株式会社 Seat belt retractor
DE10066050B4 (en) * 2000-04-17 2010-05-27 Trw Automotive Electronics & Components Gmbh & Co. Kg retractor
DE10020245C2 (en) * 2000-04-25 2002-02-14 Breed Automotive Tech Belt retractor for a vehicle seat belt

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CN1453163A (en) 2003-11-05
US6848645B2 (en) 2005-02-01
JP2003335218A (en) 2003-11-25
DE50300890D1 (en) 2005-09-08
EP1359067A2 (en) 2003-11-05
JP3795474B2 (en) 2006-07-12
DE20206667U1 (en) 2002-09-05
EP1359067A3 (en) 2004-03-24
US20030201359A1 (en) 2003-10-30
CN100354162C (en) 2007-12-12

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